A control system (40) for a turbofan (10) comprises a variable area nozzle (26) for regulating core flow ( Fc ) through the turbofan, an actuator (27), a temperature sensor (42), a flight controller (44) and a nozzle control (47). The actuator (27) is coupled to the variable area nozzle (26) to regulate the core flow by positioning the variable area nozzle. The temperature sensor (42) is positioned in the turbofan to sense a gas path temperature of the core flow ( Fc ). The flight controller (44) is connected to the turbofan to make a thrust demand based on a flight condition of the turbofan (10). The nozzle control (47) is connected to the flight controller (44) and the actuator for directing the actuator based on the gas path temperature and the flight condition, such that the gas path temperature is controlled by adjusting the variable area nozzle (26) to regulate the core flow ( Fc ) while the turbofan meets the thrust demand.